How does it work?

A GSM controller is a remote control device which can be operated via GPRS. You can remotely control gates, garage doors and barriers via mobile phone from anywhere in the world. 

1. User calls the number of a SIM card contained within the GSM controller
2. If the number of the caller is authorised by GSM Controller, it rejects the call and instructs the gate or door to open or close. If not, no action is taken.
3. The GSM Controller sends an optional SMS message to confirm the action has been carried out.